For any of those, like me, who always buck the trend and have a differing view of things,
here is a video paying homage to Harihara aka Shankaranarayana, the combined forms of
Shiva and Vishnu as God. I do not know of any mantra specifically for Harihara or Shankaranarayana,
like Om Sri Shankaranārāyanāya namaha or Om Sri Hariharāya namaha, etc.
https://www.youtube.com/watch?v=DIT5PUVa9jw
Shambo Mahadeva Sadashiva, Ambuja Nayana Narayana
Hara Om Hara Om Sadashiva, Hari Om Hari Om Narayana
Vannaga Bhushana Sadashiva, Vannaga Sayana Narayana
Kailasavasa Sadashiva, Vaikuntavasa Narayana
Gowri Sametha Sadashiva, Lakshmi Sametha Narayana
Parvati Ramana Sadashiva, Paapa Vimochana Narayana
Basma Vibu****ha Sadashiva, Sreekanda Lepitha Narayana
Anatharakshka Sadashiva, Aabathbandava Narayana
Chinmaya Nanda Sadhashiva, Chinmaya Roopa Narayana
Shambo Mahadeva Sadashiva, Ambuja Nayana Narayana
Ambuja Nayana Narayana
O'Lord Shiva, you are an Eternal God. O'Lord Vishnu, you have eyes like Lotus.
O'Lord Shiva, you are the remover of sin. O'Lord Vishnu, we call you with Hari Om
O'Lord Shiva, you wear snake around the neck. O'Lord Vishnu you sleep on snake.
O'Lord Shiva, you live in Kailasha. O'Lord Vishnu, you live in Vaikunta.
O'Lord Shiva, you are paired with Goddess Gowri/Parvati. O'Lord Vishnu, you are paired with Goddess Lakshmi.
O'Lord Shiva, you delight Goddess Parvati. O'Lord Vishnu, you are the cleanser of all sins.
O'Lord Shiva, you apply ashes on forehead. O'Lord Vishnu, you apply sandal paste on forehead.
O'Lord Shiva, you are the savior of everyone. O'Lord Vishnu, you come to the rescue of those in trouble.
O'Lord Shiva, you are full of bliss. O'Lord Vishnu, you are the Eternal God.
O'Lord Vishnu, you have eyes like Lotus. O'Lord Vishnu, you have eyes like Lotus.
here is a video paying homage to Harihara aka Shankaranarayana, the combined forms of
Shiva and Vishnu as God. I do not know of any mantra specifically for Harihara or Shankaranarayana,
like Om Sri Shankaranārāyanāya namaha or Om Sri Hariharāya namaha, etc.
https://www.youtube.com/watch?v=DIT5PUVa9jw
Shambo Mahadeva Sadashiva, Ambuja Nayana Narayana
Hara Om Hara Om Sadashiva, Hari Om Hari Om Narayana
Vannaga Bhushana Sadashiva, Vannaga Sayana Narayana
Kailasavasa Sadashiva, Vaikuntavasa Narayana
Gowri Sametha Sadashiva, Lakshmi Sametha Narayana
Parvati Ramana Sadashiva, Paapa Vimochana Narayana
Basma Vibu****ha Sadashiva, Sreekanda Lepitha Narayana
Anatharakshka Sadashiva, Aabathbandava Narayana
Chinmaya Nanda Sadhashiva, Chinmaya Roopa Narayana
Shambo Mahadeva Sadashiva, Ambuja Nayana Narayana
Ambuja Nayana Narayana
O'Lord Shiva, you are an Eternal God. O'Lord Vishnu, you have eyes like Lotus.
O'Lord Shiva, you are the remover of sin. O'Lord Vishnu, we call you with Hari Om
O'Lord Shiva, you wear snake around the neck. O'Lord Vishnu you sleep on snake.
O'Lord Shiva, you live in Kailasha. O'Lord Vishnu, you live in Vaikunta.
O'Lord Shiva, you are paired with Goddess Gowri/Parvati. O'Lord Vishnu, you are paired with Goddess Lakshmi.
O'Lord Shiva, you delight Goddess Parvati. O'Lord Vishnu, you are the cleanser of all sins.
O'Lord Shiva, you apply ashes on forehead. O'Lord Vishnu, you apply sandal paste on forehead.
O'Lord Shiva, you are the savior of everyone. O'Lord Vishnu, you come to the rescue of those in trouble.
O'Lord Shiva, you are full of bliss. O'Lord Vishnu, you are the Eternal God.
O'Lord Vishnu, you have eyes like Lotus. O'Lord Vishnu, you have eyes like Lotus.